-
Notifications
You must be signed in to change notification settings - Fork 9
/
InternalSpanContext.java
74 lines (63 loc) · 2.43 KB
/
InternalSpanContext.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
/*
* Copyright (c) 2017-2018 eBay Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ebay.opentracing.basic;
import io.opentracing.Span;
import io.opentracing.SpanContext;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
/**
* The {@link SpanContext} API defined by OpenTracing identifies the fact that {@link Span} data encompasses
* two classes of data: Data that is internal to the tracing implementation and user-level baggage. This
* class provides an implementation of the {@link SpanContext} interface and maintains that separation. The
* tracing implementation- specific portion is encapsulated within an arbitrary "trace context" object instance.
* The user-level baggage is managed separately in a {@link Baggage} instance.
*
* @param <T> trace context type
*/
@SuppressWarnings("WeakerAccess") // API class
public final class InternalSpanContext<T> implements SpanContext {
private final T traceContext;
private AtomicReference<Baggage> baggageRef;
public InternalSpanContext(T traceContext, Baggage baggage) {
this.traceContext = traceContext;
this.baggageRef = new AtomicReference<>(baggage);
}
public T getTraceContext() {
return traceContext;
}
public Baggage getBaggage() {
return baggageRef.get();
}
@Override
public Iterable<Map.Entry<String, String>> baggageItems() {
return getBaggage().baggageItems();
}
@Override
public String toString() {
return "SpanContext{" + traceContext + "}";
}
void setBaggageItem(String key, String value) {
boolean success;
do {
Baggage original = baggageRef.get();
Baggage replacement = new BaggageBuilder()
.inherit(original)
.put(key, value)
.build();
success = baggageRef.compareAndSet(original, replacement);
} while (!success);
}
}